David, while I certainly can agree that WikiTree needs to be made more user friendly, I think that your name/gender example is a great way to explore how a good intention can lead to an adverse user experience. As a gender check on first name is bound to generate a large number of false alerts, users will become annoyed and desensitised to the message, and click it away automatically, even in the cases when there's a real reason for the warning.
Just as non-Americans, who come from cultures where multiple first names are often rather the norm than the exception, may get upset by getting warnings about "unusual data" every single time we enter a perfectly normal compound first name, and eventually don't even read the text of the warning, which actually may cover other issues.
These are classical "cry wolf" situations, which only marginally help improve the overall WikiTree data quality, at the risk of alienating users.